// Created on: 1996-10-14
// Created by: Jeannine PANTIATICI
// Copyright (c) 1996-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _AdvApprox_SimpleApprox_HeaderFile
#define _AdvApprox_SimpleApprox_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <Standard_Integer.hxx>
#include <TColStd_HArray1OfReal.hxx>
#include <TColStd_HArray2OfReal.hxx>
#include <GeomAbs_Shape.hxx>
#include <AdvApprox_EvaluatorFunction.hxx>
#include <TColStd_Array1OfInteger.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <Standard_OStream.hxx>
class PLib_JacobiPolynomial;

//! Approximate a function on an interval [First,Last]
//! The result is a simple polynomial whose degree is as low as
//! possible to satisfy the required tolerance and the
//! maximum degree. The maximum error and the average error
//! resulting from approximating the function by the polynomial are computed
class AdvApprox_SimpleApprox
{
public:
  DEFINE_STANDARD_ALLOC

  Standard_EXPORT AdvApprox_SimpleApprox(const Standard_Integer               TotalDimension,
                                         const Standard_Integer               TotalNumSS,
                                         const GeomAbs_Shape                  Continuity,
                                         const Standard_Integer               WorkDegree,
                                         const Standard_Integer               NbGaussPoints,
                                         const Handle(PLib_JacobiPolynomial)& JacobiBase,
                                         const AdvApprox_EvaluatorFunction&   Func);

  //! Constructs approximator tool.
  //!
  //! Warning:
  //! the Func should be valid reference to object of type
  //! inherited from class EvaluatorFunction from Approx
  //! with life time longer than that of the approximator tool;
  Standard_EXPORT void Perform(const TColStd_Array1OfInteger& LocalDimension,
                               const TColStd_Array1OfReal&    LocalTolerancesArray,
                               const Standard_Real            First,
                               const Standard_Real            Last,
                               const Standard_Integer         MaxDegree);

  Standard_EXPORT Standard_Boolean IsDone() const;

  Standard_EXPORT Standard_Integer Degree() const;

  //! returns the coefficients in the Jacobi Base
  Standard_EXPORT Handle(TColStd_HArray1OfReal) Coefficients() const;

  //! returns the constraints at First
  Standard_EXPORT Handle(TColStd_HArray2OfReal) FirstConstr() const;

  //! returns the constraints at Last
  Standard_EXPORT Handle(TColStd_HArray2OfReal) LastConstr() const;

  Standard_EXPORT Handle(TColStd_HArray1OfReal) SomTab() const;

  Standard_EXPORT Handle(TColStd_HArray1OfReal) DifTab() const;

  Standard_EXPORT Standard_Real MaxError(const Standard_Integer Index) const;

  Standard_EXPORT Standard_Real AverageError(const Standard_Integer Index) const;

  //! display information on approximation
  Standard_EXPORT void Dump(Standard_OStream& o) const;

protected:
private:
  Standard_Integer              myTotalNumSS;
  Standard_Integer              myTotalDimension;
  Standard_Integer              myNbGaussPoints;
  Standard_Integer              myWorkDegree;
  Standard_Integer              myNivConstr;
  Handle(PLib_JacobiPolynomial) myJacPol;
  Handle(TColStd_HArray1OfReal) myTabPoints;
  Handle(TColStd_HArray2OfReal) myTabWeights;
  Standard_Address              myEvaluator;
  Standard_Integer              myDegree;
  Handle(TColStd_HArray1OfReal) myCoeff;
  Handle(TColStd_HArray2OfReal) myFirstConstr;
  Handle(TColStd_HArray2OfReal) myLastConstr;
  Handle(TColStd_HArray1OfReal) mySomTab;
  Handle(TColStd_HArray1OfReal) myDifTab;
  Handle(TColStd_HArray1OfReal) myMaxError;
  Handle(TColStd_HArray1OfReal) myAverageError;
  Standard_Boolean              done;
};

#endif // _AdvApprox_SimpleApprox_HeaderFile
